<template>
  <div>
    <!-- 面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <!-- 警告区域-->
      <el-alert
          title="注意: 只允许为第三级分类设置相关参数"
          type="warning"
          :closable="false"
          show-icon>
      </el-alert>

      <!-- 选择商品分类区域-->
      <el-row style="margin: 15px 0;">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择器-->
          <el-cascader
              v-model="selectedCateKeys"
              :options="cateList"
              :props="cateProps"
              @change="handleChange">
          </el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 动态参数面板-->
        <el-tab-pane label="动态参数" name="many">

          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>

          <!-- 动态参数表格-->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand" label="*">
              <template v-slot="scope">
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="tagClose(i, scope.row)">{{item}}</el-tag>

                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

              </template>
            </el-table-column>
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>

        </el-tab-pane>

        <!-- 静态参数面板-->
        <el-tab-pane label="静态属性" name="only">

          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>

          <!-- 静态参数表格-->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand" label="*">
              <template v-slot="scope">
                  <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="tagClose(i, scope.row)">{{item}}</el-tag>

                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                </template>

             </el-table-column>

            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>

        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框-->
    <el-dialog
      :title=" '添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed">

      <el-form ref="addFormRef" :model="addForm" label-width="100px" :rules="addFormRules">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框-->
    <el-dialog
      :title=" '修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed">

      <el-form ref="editFormRef" :model="editForm" label-width="100px" :rules="addFormRules">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParmas">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      cateList: [],
      /* 级联选择器 */
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedCateKeys: [],

      activeName: 'many',
      manyTableData: [],
      onlyTableData: [],

      addDialogVisible: false,
      editDialogVisible: false,
      addForm: {},
      editForm: {},
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    /* 获取商品分类数据 */
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败！')
      this.cateList = res.data
    },
    /* 级联选择器选项改变时触发 */
    handleChange () {
      this.getParamsData()
    },
    /* 获取参数列表数据 */
    async getParamsData () {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败！')
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        item.inputVisible = false
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    /* tab 页签点击时间的处理函数 */
    handleTabClick () {
      this.getParamsData()
    },
    /* 监听添加对话框关闭函数 */
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    /* 监听编辑对话框关闭函数 */
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    /* 发起添加参数请求 */
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败！')
        this.$message.success('添加参数成功了')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    /* 显示编辑参数的对话框 */
    async showEditDialog (id) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取参数信息失败！')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    /* 发起编辑参数的请求 */
    editParmas () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) return this.$message.error('编辑参数失败！')
        this.$message.success('编辑参数成功了')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    /* 根据参数删除参数 */
    async removeParams (id) {
      const confirmResult = await this.$confirm('此操作将永久该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        this.$message.info('已取消删除')
      } else {
        const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
        if (res.meta.status !== 200) return this.$message.error('删除参数失败！')
        this.$message.success('删除参数成功了')
        this.getParamsData()
      }
    },
    /* 文本框失去焦点或按下回车键触发 */
    handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      this.saveAttrVals(row, 1)
    },
    /* tag标签关闭,删除对应的参数可选项 */
    tagClose (i, row) {
      var attr = row.attr_vals.splice(i, 1)
      this.saveAttrVals(row, 2, attr)
    },
    /* 将修改attr_vals 保存到数据库 */
    async saveAttrVals (row, x, attr) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        if (x === 1) {
          row.attr_vals.pop()
        }
        if (x === 2) {
          row.attr_vals.push(attr)
        }
        row.inputValue = ''
        row.inputVisible = false
        return this.$message.error('修改参数项失败！')
      }

      row.inputValue = ''
      row.inputVisible = false
      this.$message.success('修改参数项成功')
    },
    /* 点击按钮切换文本输入框 */
    showInput (row) {
      row.inputVisible = true
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    }

  },
  computed: {
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) return true
      return false
    },
    cateId () {
      if (this.selectedCateKeys.length === 3) return this.selectedCateKeys[2]
      return null
    },
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>

<style lang="less" scoped>
  .el-tag {
    margin: 5px;
  }
  .input-new-tag {
    width: 150px;
  }
</style>
